Fifa Yearly Promo UK

Got a SMS that my cell number hs been selected in the Fifa Yearly Promo Uk and that I've won R900 000.00 and that i should call this number 0832394740 with a reference number. So i called as i thougth it was fraud anyway the guy tells me to call in 5 minutes. What a lot of crap how do they get our cell no???